Question

What is the function used to deregister event handler ‘f’?

(a) deleteAllListeners(name)

(b) deleteListener(name,f)

(c) removeListener(name,f)

(d) removeAllListeners(name)

This question was addressed to me in an interview for internship.

This is a very interesting question from Server-Side JavaScript topic in chapter Server-Side and Client-Side Scripting of JavaScript

Answer 1

The correct answer is (c) removeListener(name,f)

Best explanation: The removeEventListener() method removes an event handler that has been attached with the addEventListener() method. The removeListeners(name,f) is used to deregister event handler f represented as :

emitter.removeListener(name,f)